Experiemental has a more atonal style, and more avant garde influences as oposed to prog, which often showcases a more classical, jazz or folk oriented sound... Though prog is also very avant garde based, as in the case of Can.
Prog overall has certain distinct influences, which can vary, depending on the artist, but many bands share a similar sound or approach (check the prog ed thread, for furher information), while experiemental rock dosen't exactly have any truly definable characteristics, experiemental music is simply any kind of band who are truly distinct from any currently known music form, so it's really more of a term for musicians that don't share characteristics of any conventional genre, rather than being an actual genre itself... However prog can be considered a type of experiemental rock, and many so called experiemental rock bands can fall into the prog category... Genres like post rock could fall into either category.
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